Medical dressing to treat sucking chest wound

A medical dressing comprising:

• a flexible base layer including a front surface configured to face a skin of a patient and a back surface opposite the front surface, wherein the flexible base layer includes a first opening;
• an adhesive layer on the front surface of the base layer wherein the adhesive layer extends entirely around the first opening;
• a flexible cover layer entirely covering the opening of the base layer;
• and
• a flexible intermediate layer sandwiched between the base layer and the cover layer, wherein the intermediate layer includes a second opening aligned with the first opening;
• wherein the base layer, cover layer and intermediate layer are joined together along an annular pattern extending entirely around the first and second openings, wherein the annular pattern joints the base layer to the intermediate layer entirely around the first and second openings, and the annular pattern joins the cover layer, intermediate layer and base layer around the first and second openings except at slots extending beyond an outer edge of the cover layer and ending before an outer edge of the intermediate layer.